4 cinema F-20's

Hey guys,

I wanted to try something new and go DIY again. This sealed chamber horn that Lilmike designed had me interested so I ordered 4 MFW-15's. I also did not have much time to completely build these so I had eD CNC a flat pack for me. I had them groove in the Auraco Plywood like the DTS-10 kit so the panels would easily line up and take out the guess work. Well, I have even less time(Wife just had my first son!!!!) so I had eD just build the whole thing for me. They also said that the wood is not good enough for the grooves so if anyone wants to do this I would choose Baltic Birch. eD filled in all the grooves and the subs came out very nice and solid! All I had to do was screw in the driver, connect the wire, and then screw in the access panel. Here are some pics of eD building these.

































Here are some pics of my new room and the subs in their place. I have 3 M&K S-5000's on old bass bins as well. The red corners are bass traps and the back is a gold bass trap. The room is not completely finished so I will take more pics.







Here is my first raw measurement with no EQ or smoothing.



I started to watch Tron and the wife came down and complained so I have not had enough time to dial these in and take more measurements. I want to keep raising the sweep to see what happens with compression and also run THD and SPL graphs.

They are Arauco, if I used an expensive driver I would have went Baltic. Once I get rid of the in laws I will crank them up and see what they can do. Should be later or tomorrow. These only cost about $250 each to build if you DIY.

Yes, no driver though. I am thinking about maybe putting one in there. I have 4 JBL 2225's sitting here. I would have to add external XO and such though and right now it is very simple and easy.

I will be trying out some BFM DR-200's to compete against the M&K's. These M&K's keep up with the subs with no probelms. The graph was subs only with a 80hz XO. I have a new processor coming as well to try different XO points. I have an Ada Suite 7.1HD on order.

Thank you!! He sure is keeping things in perspective. I would of had 15 graphs done by now with numerous movie testing but as of now I ran this graph and watched the beginning of Tron up until Sam rides his bike. The music is very powerful and during this brief audition the F-20's were great. They put out lots of bass with very little power, I mean little, impressive indeed. Of course I am curious as to what the graph will look like when I run a 120 db sweep. I am guessing the 10hz and under will be long gone but maybe it will still be loud enough. We shall see.

I know, I am testing these speakers again. They play really loud and clear but need a tad more midbass. I am not done tweaking yet. I have an AVS member waiting for his Ashly amp that I have to get to first thing when I get home so everything needs to wait. He has waited for a while and been really patient.

This is a low level sweep and they act like a sealed sub below the knee. The 4 MFW-15's can extend low at low levels but I expect them to compress when turned up.

About a month but mine was long due to being the first trial.

I agree with you but my goal here is not to be flat to 10hz, it is to have enough 10hz-18hz to feel while the 20hz and up is first class. I will measure them with THD.

Thanks, I really love trying different designs to hear what the true in room differences are. I think it gives me a wealth of experience and learn from my many mistakes.

Why I want to complete this ASAP.

Yeah, from my brief demo I know these have serious output within the horn. You know something is powerful when it puts a smile on your friends face even after being used to 8 18's. The real test will be coming!!

I am not sure what I want but a RE-XXX 18 IB has been on my mind as well. I want to see where these take me as the look is just damn cool with that giant horn mouth. No drivers seen.